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Патент USA US2120605

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June 14, 1938.
E. L. FORD ET AL
2,120,605
CHIMNEY AND/OR VENTILATING COWL
Filed April '22, 1936
,Fig. 1.
5 Sheets-Sheet 1
2
ATTORNEY
June 14, 1938.
E. L. FORD ET AL
2,120,605
CHIMNEY AND/0R VENTILATING COWL
Filed April 22, 1956
5 Sheets-Sheet 2
June 14, 1938.
2,120,605
E. L. FORD El‘ AL v
CHIMNEY AND/OR VENTILATING COWL
Filed April 22, 1936'
5 Sheets-Sheet 3
0
June 14, 1938.
2,120,605
E. 1.. FORD ET AL
CHIMNEY AND/OR VENTILATINGYGOWL
Filed April 22, 1936
5 Sheets-Sheet 4
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June 14, 1933-
E. 1.. FORD ET AL
2,120,505
CHIMNEY AND/OR VENTILATING COWL
Filed April 22, 1936
Fig. 11. 3
5 Sheets-Sheet 5
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$38 28
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2,120,605
Patented June 14, 1938
UNITED STATES
PATENT OFFICE .
2,120,605
CHIMNEY ‘AND/OR VENTILATING COWL
Ernest Leonard Ford and Thomas Frederick
William Brown, Darlington, England
Application April 22, 1936, ‘Serial No. 75,876
-
In Great Britain April 23, 1935
:(Cl. 98-66)
v 5 Claims.
Figure 9 is a sectional elevation of a modi?ed
This invention relates to chimney and/or yen-.
vtilating cowls and it has for its object the pro
form of dome;
Figure 10 is a sectional elevation of a further
' vision of a cowl adapted to be attached to or
modified form ‘of dome;
mounted on a chimney-pot,- said cowl serving
'
' vFigure 11 is an elevation with part of the ex- 5
5 the dual purpose of preventing down-draught in
chimneys and simultaneously ventilating the
terior broken away to show interior parts of a
room to which the chimney has access, and to
this end the cowl comprises a plurality of sim
still further modi?cation, and,
_
ilarly formed equally spaced vertically disposed
pa 0 de?ector slats, each of said slats having a central '
Figure
12
is
a transverse
-
section
.
on
line
XII—XII of Figure 11 of one half of the cowl.
According to the embodiment of the invention 10
illustrated in Figures 1 and 2 designed for use
?at portion and angularly disposed outwardly
directed vertical edges, the vertical apertures be- - in chimney pots for the purpose of preventing
tween said slats being unscreened on- the outside,
so as to provide‘free rectilinear paths for the‘
15 outflow of gases from the interior of the cowl
down-draught in the chimney and also for ven
tilating purposes, the cowl is composed of a plu
rality of ?at slats I‘, the outer longitudinal edges 15
their upper ends to or formed in one with a
_ shallow dome-shaped plate and at their lower
2 of which are bent towards eachother at an
angle to the centre part of the slat. The upper
ends of the slats thus formed, of which there may
ends to a member adapted to be slipped into a
be any desired number,v according to the size of
ber'in any desired manner.
a'shallow dome-shaped plate 3 with the angular
to the atmosphere, said. slats being connected at
20
20 chimney pot or secured to a stack or roof mem- I the chimney pot, are ‘secured to the underside of
,
v
i The invention .further consists in the provision ly disposed edges 2 directed outwardly leaving .
of a second series‘of similarly formed slats con van elongated aperture lbetween ,the edges of
centrically disposed relatively to the ?rst named each ‘adjacent slat. The lower ends 5 of said
slats are directed inwardly and downwardly and 25
series, the slats of one series being disposed im
26
mediately opposite the spaces between the other
are secured by ‘rivets or in any other desired
series, but sov disposed as to provide a free. an~ manner to a plain, ‘tapered or split skirt 6 fur
nular space between thetwo series and free non hnished, if desired, with spring members ‘I adapt
edto be slipped into the upper end of a chimney
tortuous paths for the out?ow of gases. '
The invention further consists in the provi
sion of storm-proof slats or louvres in the spaces
'30
pot 8, or when, ‘used for ventilating'purposes 30
only, said slats are secured to a part adapted to
‘ between the vertical edges of the slats _for the _ be secured to a separate base or to the roof or
exclusion of driving rain.
‘
other part immediately above a ventilating shaft
4
Inthe accompanying drawings which illustrate
35- this invention:‘
Figure 1 is an elevation of one embodiment of
construction;
-
‘ -»
Figure 2 is a diagrammatic transverse section
on line 2-42 of Figure 1;‘
.
'
-
_
Figure 3 is an elevation with part of the ex
terior broken away to show interior parts of a
modification; .
I
‘
Figure 4 is a- diagrammatic transverse section
on line IV-—IV of Figure 3;
46
'
I
-
‘
,
Figure 5 is an elevation with part of the ex
terior broken away to show interior parts of a
further
modi?cation;
I
‘
_
-
Figure 6 is a transverse section on line VI—VI
of Figure 5;
50
1,55
‘
-
_
v
‘or aperture provided therein.
'
According to the embodiment of the invention 35
illustrated in' Figures 3 and 4, a further set of
similarly formed slats 9 are concentrically dis
posed relatively to the slats I, the slats 9 be
ing disposed inside of and immediately opposite
the elongated apertures 4 between the slats, I. 40
,To enable each series of slats to‘ be equal in
number and the spacing between the slats to
be approximately the same, the slats 9 are pref
erably' made somewhat narrower than the slats l
as shown; The upper ends of the slats 9 are se 45
cured to the dome-shaped'plate land the lower
ends ID are riveted or otherwise secured to the
inside of the ring ll provided at the top of the
skirt l2 which, in the embodiment illustrated,
is shown provided with a'V-shaped member I3
Figure 7 is an elevation with part' of the ex
adapted'to be secured to a roof structure, the
terior broken away to show interior parts of a 7 lower' ends 5 of the outer slats .I being formed
as above described and secured to the outside of
still further modi?cation;
'
-‘
the ring ll.
,
Figure 8 is a transverse section on line
Referring to Figuresv 5 and '6, the lower ends 5 55
VIII-VIII of Figure 7_ of one half of the cowl;
2
2,120,606
of the outer slats I are secured to the inside face
.
being ventilated or the smoke from the chimney '
of a conical member ll secured to a cylindrical
thereof being simultaneously extracted.
member II and the lower ends III of the slats 9
are secured to that part of the cylindrical mem
ber II which extends upwardly beyond the mem
ber I I. To avoid water collecting in the pocket
formed between the inside of the conical mem
ber I4 and the exterior of the upper part of
In the case of the construction shown in Figure
4 embodying the combination of two series of de
?ector slats, the direction of the wind is indicat
ed by the arrows j on the right of the ?gure, that
is, the wind is blowing directly into one of the
apertures l. The provision of the inner de?ec
the cylindrical member IS, the conical member
I4 ls furnished with a plurality of apertures I6.
in the annular space between the two series of 10
According to a modi?cation as shown in the
tor slats 9 increases the velocity of the air stream
de?ectors, thereby creating a high ejector action
lower part of Figure 7, the cylindrical member
over the apertures formed between the inner de
I5 is provided with a secondconical member II’
?ector slats and a zone of reduced air pressure is
to the inside surface of which are secured the
created on the opposite side of the cowl, that is,
16 lower ends IQ of the inner slats 9, said conical
member I‘I being provided with a plurality of
apertures l9 similar to the, apertures IS in the
conical member I4.
For the purpose of preventing the entry of
20 driving rain into the interior of the cowl, a-plu
rality of conical members I9 may, as shown in
Figures 5 and 6, be secured within the interior of
the cowl to the inner faces of the inner slats 9,
said conical members being so arranged that the
25 upper part of the cylindrical member I5 extends
into the lowermost conical member I9 and the
upper part of the latter extends into the member
at the part a.
-
15
Referring now to Figure 3, the arrows h and i
indicate downward and upward air currents re
spectively, both of which create extraction.
In the modi?ed construction illustrated in Fig
ures 11 and 12, the upper ends of the slats I in
stead of being directly connected to the dome 9
are connected thereto by spacing brackets which
may, as shown in Figures 11 and 12, be of tri
angular form having an open centre as shown at
29, or, of U-shaped form as shown at 29 on the
left of Figure 12, or, of two independent strips
similar to the strips 29-but without the part con
above same and so on. Any rain or the like that necting the same to the slat so that said slats
may be blown through the spaces between the . stand away from the dome. The lower ends of
30 slats I and 9 will be projected onto the conical the slats I are connected by means of brackets
members I9 and will drop therefrom into the III to the upper edge of the inverted cone-shaped
annular space between the conical member I4 member 9!, the lower part of which is secured to
the cylindrical member I 5. The upper ends of
and cylindrical member I! and will pass there
from through the apertures I6, or in the case of the inner slats 9 are, as before, connected di
rectly to the dome 9 which is of deep sectional
35 the construction shown in Figures 7, and 8, said
rain or the like will fall ?rst into the annular ‘form, but their lower ends are connected to the
space between the cylindrical member I! and the cone-shaped member 9I by brackets 92. The in
conical member I‘I through the apertures I9 and terior of the cowl thus formed is provided with a
then into the lower conical member I l and out plurality of conical members 99 secured at their‘
lower edges to the inner slats 9 by brackets 94 but
the apertures I8.
I
49 through
In the embodiment illustrated in Figures '7 and instead of said conical members being arranged
8, the means for preventing the entry of driving as the conical members I9 shown in Figures 5
and 6, they are, as shown in Figure 11, provided
rain comprises a plurality of horizontally and an
gularly disposed slats or louvres 20 inserted in at their upper ends with a cylindrical part 99 and
said upper ends do not in this case extend up‘
45 the space between the outer vertical slats I, wardly into the conical member above but a space '
to which they are secured in any desired man
is left between the lower edge of one conical
ner such as by riveting or welding.
member and the upper cylindrical edge of the
‘ The dome 9 to which the upper‘ ends of the
slats I and 9 are secured, may, if desired for use conical member immediately above. The upper
conical member 991 is formed somewhat deeper
in extreme cases of downwardly directed air cur
50
rents, be formed as a double dome composed of than the lower members 99 so that the diameter ‘
the annular dome-shaped plate 2I to which the ' of the cylindrical part 951 of this member is less
slats I and 9 are secured and the covering dome than the diameter of the cylindrical. parts 95 on
plate 22 connected to the plate 2| by straps 29 said lower members and the upper edge there
of lies approximately in the same plane as the
as shown in Figure 9, or, it may, as shown in
55 Figure 10, be composed of two annular dome . lower edge of the dome 9. The upper end of 5.6
the cylindrical member II is provided with a con
shaped plates 24, 25 and the covering dome
shaped plate 26 connected to each other by the ical member 96, the lower edge of which is con
straps 21.
g
The action of the cowl is diagrammatically il
60
lustrated by means of directional arrows in Fig
ures 2, 3 and 4.
.
_
Referring to Figure 2, the arrows a on the left
indicate wind blowing directly onto any slat I;
65 in this case the wind current is de?ected by the
angularly disposed edges 2 across the apertures
l and sets up an extractor action as indicated by
the arrows b. Should the wind blow directly into
any of the apertures 4 between the slats I as in
dicated by the arrows c on the right of said ?g;
ure, said wind in part enters said aperture but
is drawn out again through adjacent apertures by
the extractor action of the currents de?ected by
the slats I and the edges 2 thereof as indicated
,76 by the arrows d and e, the air from the building
nected to the inverted cone-shaped member 9|,
which latter is provided with apertures 91 so
that rain entering between-the outer slats I and,
deposited on the inner slats 9 and conical mem
bers 99, 991 will fall into the conical channel
formed by the members 9I and 99 and out of the
apertures 91.
The advantages of the foregoing construction’;65
are that it is possible to use larger outer de?ectors
and smaller inner deflectors and a reduced num
ber of each, and the outer de?ectors, standing
away from the edge of the dome coupled with the
particular shape of the dome, increase the efll-, 70
ciency of the cow] by reason of the fact that the
air flow over the top of the dome sets up an area
of negative pressure as shown, for example, at
98, and the annular space around the edge of the
dome provides for an ejector action as well as
3
2,120,605
I over the side apertures and the drain apertures , plurality of straps by means of which said plates
are spaced apart and secured together, means
31 in the lower cone 3|.
for securing the upper ends of the outer series
What we claim is:
of de?ector slats to said dome-shaped element,
1. A cowl adapted to be secured to a roof struc
ture comprising in combination a plurality of extensions formed on the upper ends of the inner
equally spaced vertically disposed de?ector slats, series of de?ector slats by means of which they
are secured to said dome-shaped element, a base
each of which is formed with a ?at central por
tion and with angularly disposed outwardly di
rected vertical edges, said slats being arranged in
10 two concentrically disposed series, the slats of
the inner series being arranged directly opposite
the spaces between the slats of the outer series, a
dome shaped element comprising a covering dome
plate, means for securing the upper ends of the
outer series of de?ector slats to said dome shaped
element, extensions formed on the upper ends of
the inner series of de?ector slats by means of
which they are secured to said dome shaped
element, a base member comprising an inverted
cone shaped member to which the lower ends of
the inner and outer series of de?ector slats are
secured, a cylindrical member to which the lower
end of the inverted cone shaped member is se
cured, a plurality of cone shaped elements ar
25 ranged within and secured to the inner series of
de?ector slats for preventing the entry of rain
into the interior of the cowl, a further cone shaped
member secured to the base member and a plu
rality of apertures provided in the inverted cone
shaped member through which water collected in
the base member may pass to the outside.
2. A cowl adapted to be secured to a roof struc
ture comprising in combination a plurality of
equally spaced vertically disposed de?ector slats,
each of which is formed with a ?at central portion
and with angularly disposed outwardly directed
vertical edges, said slats being arranged in two
concentrically disposed series, the slats of the
inner series being arranged directly opposite the
spaces between the slats of the outer series, a
dome shaped element comprising a covering dome
plate, means comprising a plurality of spacing
brackets for securing the upper ends of the outer
series of de?ector slats to said dome shaped ele
ment, extensions formed on the upper ends of ,the
inner series of de?ector slats by means of which
they are secured to said dome shaped element, a
base member comprising an inverted cone shaped
member to which the lower ends 01' the inner se
ries of de?ector slats are secured, brackets se
cured to the lower ends of the outer series of ‘de
?ector slats by means of which they are secured
to the outer edge of the inverted cone shaped
member, a cylindrical member to which the lower
55 end of the inverted cone shaped member is se
cured, a plurality of cone shaped elements ar
ranged within and secured to the inner series of
de?ector slats for preventing the entry of rain
into the interior of the cowl, a further cone shaped
00. member secured to the cylindrical member and
to the inverted cone shaped member and a plu
rality of apertures provided in the inverted cone
shaped member through which water collected in
said \base member may pass to the outside.
3. A cowl adapted to be secured to a roof struc
05
ture comprising in combination a plurality of
member comprising an inverted cone-shaped
member to which the lower ends of the inner and
outer series of de?ector slats are secured, a cylin
drical member to which the lower end of the in
verted cone-shaped member is secured, a plural
ity of cone-shaped elements arranged within and '
secured to the inner series ‘of de?ector slats for
preventing the entry of rain into the interior of
the cowl, a further cone-shaped member secured
to the base member and a plurality of apertures
provided in the inverted cone-shaped member
through which water collected in the base mem
ber may pass to the outside.
'
4. A cowl adapted to be secured to a roof struc
ture comprising in combination a plurality of
equally spaced vertically disposed de?ector slats,
each of which is formed with a ?at central por
tion and with angularly disposed outwardly di
rected vertical edges, said slats being arranged in
two concentrically disposed series, the slats of the
inner series being arranged, directly opposite the
spaces between the slats of the outer series, a
dome-shaped element comprising two annular
dome-shaped plates disposed one above the other,
a covering dome-plate and a plurality of straps
by means of which said plates are spaced apart
and secured together, means for securing the up
per ends of the'outer series of de?ector slats to
said dome-shaped element, extensions formed on
the upper ends of the inner series of de?ector
slats by means of which they are secured to said
dome-shaped element, a base member comprising
an inverted cone-shaped member to which the 40
lower ends of the inner and outer series of de
?ector slats are secured, a cylindrical member to
which the lower end of the inverted cone-shaped
member is secured, a plurality of cone-shaped
elements arranged within and secured to the in
‘ner series of de?ector slats for preventing the
entry of rain into the interior of the cowl, a fur
ther cone-shaped member secured to the base
member and a plurality of apertures provided in
the inverted cone-shaped member through which 50
water collected in the base member'may pass to
the outside.
' _
i
i
J
5. ‘A cowl adapted to be secured to a roof struc
ture comprising in combination a plurality of
vertically disposed de?ector slats, each of which 65
is formed with a ?at central portion and with
angularly disposed outwardly directed vertical
edges, said slats being arranged in two concen
trically disposed series, the slats oi the inner
series being arranged directly opposite the spaces 60
between the slats of the outer series, a dome
shaped element comprising a covering dome plate,
means for securing the upper ends oi’ the inner
and outer series of de?ector slats to said dome
shaped element, a base member comprising an
inverted cone-shaped member to which the lower
as
equally spaced vertically disposed de?ector slats. ,ends/of the inner and outer series 01' de?ector
each of which. is formed with a ?at central portion
and with angularly disposed outwardly directed
70 vertical edges, said slats being arranged in two
concentrically disposed series, the slats of the
inner series being arranged directly opposite the
spaces between the slats oi’ the outer series, a
dome-shaped element comprising an annular
dome-shaped plate, a covering dome plate and a
slats are secured, a cylindrical member to which
the inverted cone-shaped member is secured and
a plurality of cone-shaped elements arranged 70
within and secured to the inner series of de?ector
slats for preventing the entry of‘rain into the.
interior of the cowl.
ERNEST LEONARD FORD.
"
~
THOMAS FREDERICK WILLIAM BROWN.
1
75
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